Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1987-11-16
1989-01-03
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
375 82, 375 88, H03D 300
Patent
active
047959860
ABSTRACT:
A circuit and method for the acquisition of carrier synchronism in coherent demodulators which operate with carriers modulated by Phase-Shift Keying (PSK). The invention makes use of simple, low-cost circuitry and gives the phase-lock loop of the demodulator an added frequency characteristic which prevents false locks and ensures lock between the local carrier and the reference signal even for very large frequency variations.
REFERENCES:
patent: 4255713 (1981-03-01), Yoshida
AFC Tracking Algorithms, Francis D. Natali; IEEE Transactions on Communications, vol. COM-32, No. 8, Aug. 1984; pp. 935-947.
Theory of False Lock in Costas Loops, Jack Holmes, William C. Lindsey, and Kait Woo; IEEE Communications, vol. COM-26, No. 1, Jan. 1978; pp. 5-12.
On False-Lock Phenomena in Carrier Tracking Loops, Tadao Shimamura; IEEE Transactions on Communications, vol. COM-28, No. 8, Aug. 1980; pp. 1326-1334.
Allias Lock Behavior of Sampled-Data Costas Loops; Marvin K. Simon, and Kait Woo; IEEE Transactions on Communications, vol. COM-28, No. 8, Aug. 1980; pp. 1315-1325.
Ceroni Ettore
Lo Curto Michelangelo
GTE Telecommunicazioni S.p.A.
LaRoche Eugene R.
Morris Jeffrey P.
Pascal Robert J.
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